The firm also picked up the top honour in the private dwelling and new build category.

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Perthshire-based Colin Andrew Smith Architect also won an award in the private dwelling category for its Rock House.

BBC: Entries sought for Scotland's oldest design awards

Private dwelling - new build - Craignish, Lochgilphead (Cameron Webster Architects), and The Secret Garden, Milton of Leys, Inverness (Rural Design).

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Arndt was apparently in violation of Army recruiting regulations because a recruiter isn't "allowed to have anyone who would be considered influenced by your position in the Army in your private home, in your dwelling place, " said Kathleen Welker of the U.S. Army Recruiting Command.

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